Amazon.com: HQRP 4-Pack Battery Compatible with Garmin Vivofit Vivofit-2 Activity Tracker Fitness Training Computer (2 Batteries fits Training Computer + 2 Batteries fits Heart-Rate Monitor) 010-01225-00 : Electronics
Replacing the Batteries
Amazon.com: Garmin vivofit jr. 3, Fitness Tracker for Kids, Includes Interactive App Experience, Swim-Friendly, Up To 1-year Battery Life, Digi Camo : Sports & Outdoors
010-02441-32 Garmin vivofit jr. 3, Fitness Tracker for Kids, Swim-Friendly, Up To 1-year Battery Life, Disney Princess
vívofit jr. 3 Owners Manual - Replacing the Battery
Support: Battery Replacement on a vívofit® jr. 2 - YouTube
vívofit Owner's Manual - Replacing the vívofit Device Batteries